Have you checked your resolution with the nvidia-settings tool? I use KDE and I have a refresh rate of 50 as reported by KDE, but nvidia-settings reports 75Hz. I tend to believe the nvidia-settings refresh rate. If you don't have nvidia-settings just do "emerge media-video/nvidia-settings" and it should show up in your "System" menu.

Have you checked your resolution with the nvidia-settings tool? I use KDE and I have a refresh rate of 50 as reported by KDE, but nvidia-settings reports 75Hz. I tend to believe the nvidia-settings refresh rate. If you don't have nvidia-settings just do "emerge media-video/nvidia-settings" and it should show up in your "System" menu.

It's not really running at 50Hz at all. It's nVidia's DynamicTwinView that makes all the refreshrates look screwy for compatability with TVs and some other things. Add;
Option "DynamicTwinView" "0"
to xorg's card device section to turn it off.

Now, there a strange thing
Gnome says 1280x1024@50 while nvidia-settings say at this time 1280x1024@60
When I change Auto mode to 60Hz in nvidia-settings, Gnome says it's 1280x1024@79
When I tell it to write it to xorg.conf it wants to add these lines:
In Monitor: HorizSync 30.0 - 71.0 and VertRefresh 56.0 - 75.0 - but I leave them as they are (from Product Spec)
In Screen: Option "metamodes" "1280x1024_60 +0+0; 1280x960 +0+0; 1152x864 +0+0; 1024x768 +0+0; 800x600 +0+0" - I add this option and nvidia-settings say it 60Hz but Gnome again says 50Hz (not 79) _________________p3k4

Seize the time, Meribor. Live now; make now always the most precious time. Now will never come again...Jean-Luc Picard, Star Trek TNG - The Inner Light

It's not really running at 50Hz at all. It's nVidia's DynamicTwinView that makes all the refreshrates look screwy for compatability with TVs and some other things. Add;
Option "DynamicTwinView" "0"
to xorg's card device section to turn it off.

That did the trick. Thanks.
I didn't know this option.
I have already put README.gz from latest nvidia-drivers on my Desktop today morning but haven't read it yet.

Hi guys, I added correct Modeline line into xorg.conf, trying to get 1024x768 @ 60 Hz, but into KDE freq. selection panel, there are still "weird" 50, 51 and 53. Can someone tell me how to check "real" current freq. and maybe how to make it real 60? :>

Hi guys, I added correct Modeline line into xorg.conf, trying to get 1024x768 @ 60 Hz, but into KDE freq. selection panel, there are still "weird" 50, 51 and 53. Can someone tell me how to check "real" current freq. and maybe how to make it real 60? :>

Have you checked your resolution with the nvidia-settings tool? I use KDE and I have a refresh rate of 50 as reported by KDE, but nvidia-settings reports 75Hz. I tend to believe the nvidia-settings refresh rate. If you don't have nvidia-settings just do "emerge media-video/nvidia-settings" and it should show up in your "System" menu.

Why is the refresh rate not reported correctly by utilities that use the XRandR X extension (e.g., the GNOME "Screen Resolution Preferences" panel, `xrandr -q`, etc)?

The XRandR X extension is not presently aware of multiple display devices on a single X screen; it only sees the MetaMode bounding box, which may contain one or more actual modes. This means that if multiple MetaModes have the same bounding box, XRandR will not be able to distinguish between them.

In order to support DynamicTwinView, the NVIDIA X driver must make each MetaMode appear to be unique to XRandR. Presently, the NVIDIA X driver accomplishes this by using the refresh rate as a unique identifier.

You can use `nvidia-settings -q RefreshRate` to query the actual refresh rate on each display device.

This behavior can be disabled by setting the X configuration option "DynamicTwinView" to FALSE.